Tunnel cluster

Dr Jeremy Jones and Radswiki et al.

Tunnel cluster (TC) is a type of Nabothian cyst characterised by complex multicystic dilatation of the endocervical glands.

Tunnel cluster is found in ~8% of adult women, 40% of whom are pregnant, almost exclusively multigravid women, and older than 30 years.

They may occasionally cause mucoid discharge 7.

A tunnel cluster is more likely the result of a stimulatory phenomenon occurring during pregnancy that can persist for a variable period. It is a benign pseudoneoplastic glandular lesion of the cervix and is usually comprised of a rounded aggregate of 20-50 closely packed tubules of varying sizes.

Tunnel clusters can be characterised as:

Tunnel clusters are supposed to be involutional in nature and are usually of no clinical significance 5.

They were first described by Fluhmann in 1961 5.

On imaging appearances consider:

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Article information

rID: 14968
System: Gynaecology
Tag: cases
Synonyms or Alternate Spellings:
  • Tunnel cluster
  • Tunnel clusters
  • Endocervical tunnel cluster
  • Endocervical tunnel clusters
  • Endocervical tunnel cluster (ETC)
  • Tunnel cluster of the cervix
  • Cervical tunnel cluster

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